A method for measuring and extracting actual driving displacement of automobile wheel center
A technology of displacement measurement and extraction method, which is applied in the direction of wheel testing, measuring devices, instruments, etc., which can solve problems such as error, low frequency response of pull-wire displacement sensors, and difficult installation, and achieve wide sampling frequency range, high sensitivity, and improved accuracy sexual effect
Active Publication Date: 2019-08-02
重庆清研理工智能控制技术研究院有限公司
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Problems solved by technology
The frequency response of the pull wire displacement sensor is too low, and there are more errors at high frequencies; the potentiometer sensor has high precision, but it is difficult to install; the laser sensor needs a reflective surface, and is easily affected by environmental factors such as dust and light brightness
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[0033] The present invention will be further described in detail below in conjunction with the accompanying drawings.
[0034] A method for measuring and extracting the actual driving displacement of an automobile wheel center, characterized in that it comprises the following steps:
[0035] a. Install the acceleration sensor on the wheel center position of the vehicle wheel to be measured, and sample the acceleration data of the wheel center;
[0036] b. Smoothing the sampled acceleration data is based on the principle of the least square method and adopts the following formula:
[0037]
[0038] Carry out linear moving average of discrete data on the acceleration data of the wheel center;
[0039] In the formula, y is the smoothing result of the wheel center acceleration data; x is the wheel center acceleration sampling data; m is the number of data points; 2N+1 is the average number of points.
[0040] Use the Welch method (average periodogram method) to solve the self...
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The invention discloses an automotive wheel center actual driving displacement measuring and extracting method which comprises the following steps of a, mounting an acceleration sensor on a wheel center position of a to-be-tested automotive wheel and sampling acceleration data of the wheel center; b, performing smoothing processing on sampled acceleration data, and eliminating high-frequency noise; c, performing Fourier transform on a time domain signal of the acceleration data after smoothing processing in the step b for obtaining a frequency domain signal; d, performing two times of integration on the frequency domain signal for obtaining a wheel center displacement component; and e, performing inverse Fourier transform on the wheel center displacement component for obtaining a wheel center actual driving displacement signal. The automotive wheel center actual driving displacement measuring and extracting method has advantages of high convenience in mounting the sensor, relatively high detection sensitivity, relatively wide sampling frequency range and relatively low influence by environment factors. Furthermore, a Welch method is utilized for accurately determining a passband frequency range in integral transformation, eliminating high-frequency noise, improving integral transformation accuracy and improving measurement accuracy.
Description
technical field [0001] The invention relates to the field of automobile detection, in particular to a method for measuring and extracting the actual driving displacement of an automobile wheel center. Background technique [0002] In the dynamic stress calculation, fatigue simulation analysis and vibration analysis of the body and frame, it is necessary to provide vibration displacement data. However, in the actual vehicle test, due to the limitation of equipment and environment, it is difficult to measure the vibration displacement response curve of the testing point of the test vehicle, and sometimes it is even impossible to measure it directly. [0003] At present, in the road test of the whole vehicle, the displacement of the wheel center is mainly measured by the pull wire, potentiometer or laser displacement sensor, but these three displacement sensors have limitations in the road test. The frequency response of the pull wire displacement sensor is too low, and there ...
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IPC IPC(8): G01B21/02G01M17/013
CPCG01B21/02G01M17/013
Inventor 邹喜红王耀伟彭吉刚袁冬梅程凯华王瑞东田横
Owner 重庆清研理工智能控制技术研究院有限公司